#include<stdio.h>
int main()
{
	int high,up,down;
	scanf("%d%d%d",&high,&up,&down);
	int day = 0;
	while(high != 0)
	{
		high = high-up;
		day++;
		if(high>0)
		{
			high += down;
		}
		else {
			break;
		}
	}
	printf("%d\n",day);
	return 0;
}
